Osborne Books - Activities for Chapter 2 - 2.2

ash2204
ash2204 Registered Posts: 4 New contributor 🐸
Hi,
I'm wracking my brains trying to figure out how you calculate the selling price in year 10.

Year One - selling price is £100
Year 8 - selling price is £21


And from part one, I know selling prices are decreasing each month at a fixed percentage.

Can anyone help or direct me where to look?
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